There is no problem with legalizing gambling because it's just a form of entertainment and it could give a little boost to the economy especially
if more investors will operate, as long as it's properly regulated and the rules applied strict for the benefit of all, there would be no problem.
Right now, it's easy to bypass illegal rules on gambling because blockchain is here.
Legalizing may give avenue for anyone within the age range to end up being able to gamble and sure exposes the community at large to a lot of it. However, how each person end up seeing gambling or perceiving gambling is dependent on them.
I still believe that legalizing gambling is something that is not bad at all as it is better than seeing people try to do things hidden when they realize it is illegal and a lot of criminal activities can go on in that regards, but when it is legalized, the ability to control a lot of things will be there with regulations.
Do you know that gambling has destroyed millions of people and families? You say that it is only entertainment and fun, Lol. India legalized bitcoin not because of the entertainment but because the government have imposed taxes on gamblers. It is good for both the gambler and the government as well because now gamblers can gamble legally and government has increased its revenue.